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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb822bee23c6cfa61c9f86822990e5cec0de752389c6e51592c77fe2ac31427' 
  AND token = 'vNVrsmbuzK5ZiXGgFe8et47GkY3vZFHZosx7YF3h46A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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