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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3480c7f7ad330231764a3db6c3fcce00fadb331c2968f14081aba604881526f6' 
  AND token = 'VDFDONNfBkRSVU3kIHWHH0hFs2peoOHdMDFCybr8BN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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