Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2806fb57a5140a7eded6a7162f61ec795f89ebe8ee600bd19ebe49a712b410' 
  AND token = 'j7ZMCLjQRMH8LnDeLDIYpo2MMJr5Xrkff/O9f+CUi70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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