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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2339af6719cf34040a4eda370a58253df667c761b72bbc418d7e92e44dcb4a57' 
  AND token = 'CvDE+SWJVZJ+ucSOSq6zI3EidvTbpyEiXVdF+N0a+zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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