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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a925a33cddfc02dacf15470a3289959656bdd96a60956856bc4d42fe0d7730' 
  AND token = 'is+0X10hRcZKiVoRoMvY6Pe9xCIL4cd1KUhxmZRsp3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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