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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710e8e6f5cf3ce658f7e7d1bf5243186f922a223d6a83d07d7786d067eddadc5' 
  AND token = '87SBZA/ciuk6vNRSCxt34N7tQvFgmYESPN00LcxYuRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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