SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4e0f6c736d52430e6f69e57d81722df3645cf17a25f8a8e292d824d8f1d0b6' 
  AND token = 'lC/hG4CmV5k1MLXKpunPRduNISSKXjC0APDZ9ousYDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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