SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc060a72bc028727571e9243c61bc214d77e96e2ee5ba6423fb4cff90f960ca' 
  AND token = 'ZhiW5PPf3sz+swNIo/qL0gGnpoLfbvjKqgWht5vpacc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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