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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019b79144a155c7eb3dfb9a7ba3b19720e03525ce68cbc9066949483661a6d8b' 
  AND token = '6cYOnttQ0JGdwklvpJU27PsBXrzeopoKBOv2oBPAuvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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