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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9478ac098fdc57b6d53830862cb13502963ece9133f3a90404766b60d259b134' 
  AND token = 'm/JoRjPpFfh6G1RJRz68Sks3FzsJ2rtRKL2/ftAne20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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