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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb33620cc17515865baf06244f811193f7b37632c31ffd2b6c006272a6fdea3' 
  AND token = 'ILH9l7oSEtPdt9DvJW/uXmkv8FtGfbAqKZQ+KTtOm5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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