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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f15e55b81a76b9812c2a48c86d82fa8793cc3586c32d9d9ced48b32df99b18' 
  AND token = 'eW0Dj5ZG9TlZE7g565E3qPUr/uK2od5KFkEsGhs035Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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