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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b158efb31e21e0b8e1bffc4e793c6dfbd86f7fb4f738fe1de3557ca9c450bb8' 
  AND token = 'bUbhpe7dnhrnJD0MU8DuAts9DmlYU5B5LLCd0jRx2RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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