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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c238a37b122291a9bbe33be4788b2523cd6f4e3032d38e53717d2d38b41f62f' 
  AND token = 'Ck8fCQav7Pow6koQQi7RWHDzuPQArOThDlqX9EJ7+UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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