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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d9a430780358fed1524cdbb66d3ccc5a544966c7e8314519d932ecaa330b52' 
  AND token = 'IrP8fWvzqx7VI/rGPc21J1WbQROCUi2mIccvMrhJeBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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