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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722d628fba70baddc05f6609b265aeb8e5975e6573b579d91a24ae78688e8f2f' 
  AND token = 'lNzsNiH7DoQ6wgNDZ22sxnCC3p8f0g7sPbZepgBktu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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