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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d03d7b63730fc73b73e5adb2b3c833ddb800bd4a6fdafd621eb85321b50d993' 
  AND token = 'AP7i/w780vq2yKLaWMLpMwyFEaKCn9ES+oMaN3h/dSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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