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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9674b3ea806ce2ba58de4d3f3f5547b6fadf750fb1452285d7dcef1fda3635d9' 
  AND token = '2zoankJwGqy5EvNIlsZSM4WPmqsCTGtCsP+wCrhQca0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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