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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56e7fb1617aa51673d672bd9e6ebe90b858b89d02caac712e6cc5b01702a395' 
  AND token = 'jqzGyQsvPpM/0FAR+3Lle0m3WcUl4xAcPC6DRbh4uN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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