SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cc895613dc3ac6e8a9a6b8f84330f766050b41b5c1e7e72ad42a204b69f110' 
  AND token = 'JRim04x1/ldZTq95hBnA/PkOwXSc8jWomgQK/X9mRdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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