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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8942ee328dc86b115d25db370e56f49d7b2debc87eb3db789ef0e561f6680074' 
  AND token = 'eGSBNunDB3+KpGPv+JdhYmicIbvbodaIENN819dxcVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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