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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe40cf8e27ae273f29ec6b0d3ba33329e53ebc132745d7a7fcdfe78fe47eeb6' 
  AND token = '3R+zQZOaYm8A6Y31/m3v6OpiaJjyR95mkZJhBVQc45k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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