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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0316ce4f0b843eb3b1e0832d9c41486d66e9b2e38a253c71071f72bf640bd6e3' 
  AND token = 'Ze+SnAQDQJfHIhIQ0HDGON1DwXusr4fUEHmHwgBSngI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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