SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4ac7caf7175e7f7724eb6e9992d180f86d793e7199328388e809a930f1006a' 
  AND token = 'XchKfoZC+d54Pcvf+g5mg1LwbLq6u4687yVfu/sJyGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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