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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f98935545557108906e0e9aa850bdbff218cab0f170ee0ffb6c278a11116650' 
  AND token = 'G+jcOJRey02AHg+7+fRfMgefsji0nkik+JQJqrQMnuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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