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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e53f64405278c86de140ce5dbaf95167d35320601215945ababc630e2eb837' 
  AND token = 'GQPq+DWR1bT/lUm6gV3txNMAxFEbFf9EZqxZpM2wrgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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