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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc4a90dfc53bba09c3054ff02ff98154702646b387405051a642a3e3cf5a28f' 
  AND token = 'ObltvQGLKl1dlMnME+ruG18vCMAHjg7xJLZHlen+jdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}