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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013a27d6531bcdac5467242a002003960e0404b088787812d1255a46c35aa3a3' 
  AND token = 'K0MuwIpad9oORNz2KmZOLt+tFfXK24J4TvAPvGEKHiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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