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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bcda201ec2f3977d2164019b213f37fe04b2d0ab4b2bad3b9ec479d53b0923' 
  AND token = 'F5DkMBmWGYP6Ecn6NKn8/AKAlZeEBhp1Bx2IpzwoCJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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