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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fc63e7b82fbddfab6da12604b5ac594890940a71e740d59f6dbd497b170b6d' 
  AND token = 'p9FUz5NDw8ERbthKpqDFAFs/5uHz/l5k4rbw1q5V+SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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