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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cb80e3d5db744d6e21a0ff35f59bb16911acea600bccdaefbe87df7bfdb85a' 
  AND token = 'iVoPT8w3gd6pKOk+8EAwiZ9cqj1eBEwBzpy8/Pyytmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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