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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff835fd88307e7584b71624af743c4601be9c95524574fc72b6e4b4bbba4be3' 
  AND token = 'qP51TKRGxWa1/c2txEsqaKFQEaleBncwRcK5GC+NA54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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