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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd35048406f6ccda271c8ad50ce77571bfebf29538b2e5c5c6a240533f84f6f' 
  AND token = 'zlnxXa0aR7sR89B99zvzKvxSpccLlJs3U0OTVoNu0ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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