SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007d1acd1e9787d80ea20c8925c7a38906e1fabd3f398a3f366edef443dc4648' 
  AND token = 'OP4EWwMcBswx2SM2DB+7Aq5MhEw+uQvGY1JQBJmjB+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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