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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e3b3aaf96d77ed78d9e2b1b61cce21d3a9ebce0da2c262545b9ac08b95e88c' 
  AND token = 'B5DyQaYRGHzLW+mEcWHfXD6vVDNrd/xWT56PmlcV5uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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