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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331ab585d44d37926a73268456de01e684ecf80fcd4bab0aaccc6b65e0b7a9cf' 
  AND token = '7wUIi85OUOoBw8Cb+xBDvzY4czHjxgIO+TL34Sx1m+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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