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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5540cdc5dd4f5c713b89d2ebcc64ab7d43c30042718a41da8ba43f76bbd9694f' 
  AND token = 'oJirerl2vKg54TibTtMrbmje/ElFSw4iO/1TZqrZq+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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