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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311e13b89b8c7c654e59df241c3e3463c1644c54eee91bbb91b3eb5d6c04c15d' 
  AND token = 'OEa0P4+F9cHZDBsAYulUhO2X41tsKwIXfW4LcT03PbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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