SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9475e63b52562c23bb157da0b7c90a18073df249434fbfe62a377c81c0aff3b' 
  AND token = '1m0dG9iEHwOHdIEQ48dXKDjVu9F4jYzOzTgZNDAYfVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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