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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224fcc414bb8eaeb8bdf749c9c8c15b97bc9c633b1c25f1f3465f3f12cf7f64f' 
  AND token = 'icwyBfWBHgTVFHBxaqiMSs1hsC+VPbe7EyvBwLTpeI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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