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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af7d03cfc9dd0fddb156859bdfb27cd373544586cbdc6b3e69c060b05d27e01' 
  AND token = 'dJ2I2WeuwYtZy3Ghb7gJv/gYLOqbHI8DWyWzVS3OxlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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