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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa2c79f846569d6d232c4627039309c61206e585ce1b052e4f34b97c2a0d9f9' 
  AND token = 'RxNkyuAhiBwuPxo8myPwx7rxccobjwR7Zmwl3j4Mq3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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