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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91fa9a529d4a2901253ef3ab262aaa07eab3e5af906361a25ac812a66ab94be' 
  AND token = '2Ic84Jz6YCnhz+wOljrN9QzZdyl7p3jPRywy9Es3/Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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