SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f9dbf3426192e6d974d3302b899181d110c2047c471f5ef3531ce92082bf86' 
  AND token = 'CH4sJclVH+bZEIscHBgMGaTYqsohi7W8QI/V+tov2I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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