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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d520d55728e75cbc2b1c116c861f201c314c9ee36bf8d9eee2ea3583d56531' 
  AND token = '2EHPGGSiwsijwCuDJ9066LWZJeKsHcRHdCr/A6pVc4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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