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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1438299b7110d8cb0d9da7da7cd5251095765cb7f63947d516a37a55f73dc2ff' 
  AND token = '8s2sPxXbHhXj4a79DVm4qlo8FVSHlO1QK4v1wTMa1jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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