Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d0b01b43a7d075f2216c26a831ed73f25b747c1d409ee3a89023a38091faaf' 
  AND token = '/d7yDeKF8nM8slFV6py1RQCrzl0zM2sfGVExcDWCPFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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