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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3ebaaf8e3046c66710f944b19266132d4e260d16a4cb9b7921c009f975b147' 
  AND token = '2OZJ5QWRCbdgnr4RHf0hpUjreNxtBiFaE3HM8kKOuzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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