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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2feb0a1aafbaee28d4d6c3973f6576f3e6cef867ceb4e0fa0ce1376eaa79b5c' 
  AND token = 'OnE+hPu3kBoUId1iU/egx+dvU0XMVdyCpBNQXmrw0pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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