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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a88eb68a4f199e8296526a5a04e5761852509a977800136d18ecb2ffd0adb0' 
  AND token = 'HuCeiTtMlP3HhMI22SwNB2g9dIcRnuHHRZNT0eYWZvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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