Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9660a316e121ad482e58a1c8f0d68324e4f4605d9af265260f9d929ce84c5f' 
  AND token = '5tRiuqaYBexXa47VkNzyWTC71XC4Axb1VtRRRMXY6iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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