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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef679fcd55ad8c254760fa796ab31a9b268b02a6e681da1c630d35131d3dbc13' 
  AND token = 'rlOz80SvhOTJ8+ne498ZWBRVNr6WH6/vOtmbtJMQZhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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