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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05aa02f21eb7799ef90f4d27af2eadd0c11c18fe8fbef27ea72b49de0a4ad2f9' 
  AND token = '8iTv0gI12XjF4PqllKrj/qgQwHbM70/RtX/CzIFAd58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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