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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837591c56c998fde660404f12c75b260030c217044aaac41dafcc4ef3ffd0031' 
  AND token = 'ZBLFtZop1kOJoyRMlnZNZkn8QYr0WCg+coCwklHtn+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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