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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9989f25fad534690b481229be7b31745692e59610258e5c304e390860b65fe04' 
  AND token = 'hSXVEazTFY/UMVzCq8co1m0Wm3XHBansyQGo/cmUAb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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