SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723b30890d476ec12d7bff4d64cdbc0495db7e5e6c950f25c47ab98649e16963' 
  AND token = 'VyWKHHrTl+hFrRtoaA3Qi/20shd8+vmLvTVmGsdfgHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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