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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2dbfb9a56db1d4835d160e144c70c5ea6cab6472de1913d5292de5b5dc1486' 
  AND token = 'mvoAt2hGcpffCRIgkFUSpQ9cTnsOfyItDOX5LvnpjC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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