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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced7e001f0f969258787fd823a3db6660de0ed762b5584850d989af145fc67d4' 
  AND token = '1kxFj9IXtD0oWJW1rWHU/6pJ3VGO34EN1TATxH4KSXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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