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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0cfe54d7bf8cda3d995cb2be5880e933133149b3751194a8e32fca446a07c0' 
  AND token = 'qXtLi9k39fBbk4EouPmVfnP+Ux8Y3enVbZx7bfNOHic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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